NAT on Cisco Pix

I have set a site to site VPN up which works fine however, The other side say that they can see my private address. They need to see me as my public address.
The tunnell will be used for FTP only and ALL traffic will start at my side (Only put).

Thankyou very much for your comments. I was forced to have the conference call today to address the problem. To my suprise I managed to get it sorted as follows : (All via GUI)
As previously told I already had a tunnel set up where my private IP was visable.
I added a static route for my private IP to translate to a spare public IP. For a while it did not work. I checked the exemptions and fond that when removing the exemption in the ipsec config it infact did not changed the config. I removed the exemption from the translation rules screen and it started working. how shocked was I. Thanks a lot anyway guys, I am NO cisco expert so I may not be able to help you guys but am grateful for your time